/Engine/Source/Editor/SequencerCore/Public/MVVM/Views/SOutlinerView.h
Called whenever a drag is detected by the tree view.
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnDragDetected ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & InGeometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & InPointerEvent )